Improvement in devices for cooling mill-burs



E. EM BREY & T. J. BLACKBURN.

ng MiH-B urrs.

Improvement in Device for Cooli No. l28,132,

Patented June 18, 1872.

UNITED'STA'IES PATENT OFFICE.

ENOGH EMBR-EY AND THOMAS J. BLACKBURN, OF WEST LIBERTY, OHIO.

IMPROVEMENT IN DEVICE FOR COOLING MlLL-BURS.

Specification forming part of Letters Patent No. 128,132, dated June 18,1872.

To all whom it may concern:.

Be it known that we, ENocH EnBRnY and THOMAS J. BLACKBURN, both of WestLiberty, in the county of Logan and State of Ohio, have jointly inventeda new and useful Device for Cooling Mill-Burs, of which the following isa specification:

Our invention relates to devices for cooling mill-burs and theirinclosing-cases in the process of grinding; and our said improvementtherein consists in the construction and arrangement of a fixedair-brake or stop, the vertical branch of which is secured to the fixedinclosing-case, and forms a junction with a top branch, extendingdiagonally over the revolving bur in connection with openings in thesaid case on either side of the air-brake, one of said openings servingto supply the cool air within the case by means of the suction of therevolving bur, and the other as a means of exit for the heated air whichis carried against the vertical and lateral branches of the brake, andthus held or interrupted in its motion with the bur and drivenout of thecase at the arresting side of the brake, thereby serving not only tocool the bur, but to keep the inclosing-case from becoming heated andprevent the clogging up of the space between the case and the but withcaked flour, and thus avoid the necessity of having to remove the caseto clean it out, preserve the hoop from rot, and save the loss of flour,which usually gathers and incrusts the heated case, as heretofore.

In the accompanying drawing, Figure 1 represents a vertical section of apair of millburs with their inclosing-case, showing our improvementapplied thereto. Big. 2 represents a section of the inclos'ing-case,showing the inlet and outlet openings on opposite sides of the brake;and Fig. 3, a horizontal section of the case above the air-brake.

To the inner side of the case a I secure a strip of metal, b, in avertical position, to which a leather or other flexible strip, 0, issecured, so as to extend at an acute angle to the radius of the bur f,-across the space e,between the case a and the bur f; and to the top ofthe case a similar metal strip, g, is secured for the attachment of aflexible strip, h,

which extends over the revolving bur in the space '5, between it and thetop of the case at an angle, forming a tangent or nearly so with thefeeding-opening j in the case and bur. The two strips 0 and h thusarranged have a fixed position with respect to the side and top of therevolving bur f, and are located between aninlet and an outlet opening,is and l, in the case, while these openings must be arranged withrespect to the discharge-spout m, of said case, so as to receive the airfrom one side of the discharge-spout m, and cause it to pass out of thecase on the other side of said discharge-spout, thus encircling theinterior of the case and the outside of the bur with a passing currentof cold air, which,while greatly reducing the heat of the bur, keeps thecase or hoop cool and clean by driving out the heated air.

These openings 70 and l in the case a are of great advantage inconnection with the airbrake, for without them the space between thecase and the bur would gather dough to the extent of twenty or thirtypounds in the period of every ten or fifteen days, and must necessarilybe as often cleaned out; but by our improvement this difficulty isentirely avoided, the case or hoop kept from rotting, and this greatloss of flour saved.

The bur turns with the sun; but, when oth-. erwise, the inlet and outletopenings and the air-brake must be arranged accordingly to produce theresults described.

The inlet-opening k should be about two inches wide and eight incheslong, and provided with a sliding door to let in or out the requiredamount of air, and the outlet opening Z should be about three incheswide and four inches in .height, which will give the necessary inlet andoutlet for the air as it is The interior vertical fixed flexible strip calsoforobteiningtheadvantages hereinstztted, with its horizontalflexible branch strip h aras described. ranged to form an air-brake atthe side and ENOGH EMBREY. top of the bur, in combination with the inletTHOMAS J. BLACKBURN. and outlet openings 70 and l in the case, an rangedwith respect to the air-brake and the Witnesses: flour-discharge spoutm, to keep both the re- R. N. JORDAN, volving bur and the inelosing-casec001 and H JENNIE JORDAN.

